Abstract: It has been found out that there exist basin tectonic outline, basin deposited characteristics and hundreds of structures, with creating geological theory and methods during the petroleum exploration proceeding in the East China Sea. The 8 fields including Pinghu, Chunxiao, Tianwaitian, Canxue, Duanqiao, Baoyunting, Wuyunting, Kongqueting came to show from the buried, which formed the resources basis of oil and gas development in the East China Sea. The theory and methods creation is the key point by which more fields are to be discovered and evaluated, and more clean energy resources could be supplied to the delta area of Changjiang River in China, promoting economic development continuously.